Hi,
According to the Silicon Errata for AM1806
http://www.tij.co.jp/jp/lit/er/sprz314h/sprz314h.pdf
at chapter “2.1.5 System-Level ESD Immunity Usage Note”, the following design is recommended.
However, load current to X1 could be about 12.5mA if the above design is implemented.
12.5mA is too big, and the waveform may become loose.
And also, because of the following condition is satisfied
Voh(out out of X1 High) < Vih(threshold of incoming high to AM1806)
then unexpected behavior could be occurred.
Question 1:
Why so little resistance are recommended to R1, R2?
Question 2:
What is the recommended Crystal oscillator for X1?
Best regards,
HaTa.